NCERT Solution for Class 10 Science Chapter 1
Chemical Reactions and Equations
Exercises Questions
Page No-15
Questions No-4
What is a balanced chemical equation? Why should chemical equations be balanced?
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A reaction which has an equal number of atoms of all the elements on both sides of the chemical equation is called a balanced chemical equation. The law of conservation of mass states that mass can neither be created nor destroyed. Hence, in a chemical reaction, the total mass of reactants should be equal to the total mass of the products. It means that the total number of atoms of each element should be equal on both sides of a chemical equation. Hence, it is for this reason that chemical equations should be balanced.
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A reaction which has an equal number of atoms of all the elements on both sides of the chemical equation is called a balanced chemical equation.
As per the law of conservation of mass, mass can neither be created nor destroyed. Hence, in a chemical reaction, the total mass of reactants should be equal to the total mass of the products. Thus, the total number of atoms of each element should be equal on both sides of a chemical equation.
A balanced chemical equation is an equation in which the number of each element are equal on the reactant side as well as in product side.
for example: BaCl2 + K2SO4 → BaSO4 + 2KCl
reactant side product side
Chemical equation should be balanced because only a balanced equation tells us the relative quantities of different reactants and product involved in the reaction.
A balanced chemical equation is a representation of a chemical reaction that shows the same number of atoms of each element on both the reactant and product sides of the equation. In a balanced equation, the law of conservation of mass is upheld, which means that matter is neither created nor destroyed during a chemical reaction. This principle is fundamental in chemistry.
When the number of atoms of reactants is equal to the number of atoms of the products, the reaction is called a balanced chemical equation. According to the Law of conservation of mass, total mass of the elements present in the reactants must be equal to the total mass of the elements present in products. That’s why a chemical equations should be balanced always.